Not always 100% on point when it comes to fonts in embedded frames (sometimes the font is greyed out and the background stay bright and shiny, also colours are sometimes darkened out or false) but that's rare and also highly depends on the code of a webpage. By far the best solution to work in low light atmosphere!

Genial!!!

La extension cumple perfectamente su funcion, lo uso en firefox de android y firefox MAC es una de las mejores aplicaciones que he probado.

Works Good. Thank you.